[isidorus-cvs] r598 - in branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets: base complexData views - isidorus-cvs@common-lisp.net - mailman3.common-lisp.net

11 Jul 2011

Author: lgiessmann
Date: Mon Jul 11 08:07:34 2011
New Revision: 598
Log:
gdl-frontend: Widgets: implemented the method GdlView.getStartElement that returns the a topic that represents the first visible object within a GdlView instance
Added:
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPosition.java
Modified:
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPsis.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/TestClass.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/complexData/GdlDateTimePicker.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlCreatorAssociationView.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlDefaultCreatorTopicView.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlEditorAssociationView.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialCreatorTopicView.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialEditorTopicView.java
   branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlView.java
Added: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPosition.java
==============================================================================

--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPosition.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -0,0 +1,15 @@
+package us.isidor.gdl.anaToMia.Widgets.base;
+
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
+
+public class GdlPosition implements GdlDescriptor {
+	
+	
+
+	@Override
+	public Topic getTmRepresentative() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+}
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPsis.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPsis.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/GdlPsis.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -200,7 +200,7 @@
    	public final static String gdlPosition = gdl + "position";
    	public final static String gdlNthPosition = gdl + "nth-position";
    	public final static String gdlButtonPosition = gdl + "button-position";
-		public final static String gdlTmbinding = gdl + "tm-binding";
+		public final static String gdlTmBinding = gdl + "tm-binding";
    	public final static String gdlViewBinding = gdl + "view-binding";
    }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/TestClass.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/TestClass.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/base/TestClass.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,13 +1,21 @@
 package us.isidor.gdl.anaToMia.Widgets.base;
+import java.util.ArrayList;
+
 import us.isidor.gdl.anaToMia.TmEngine.jtmsBasedEngine.JtmsTmEngine;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Occurrence;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.complexData.GdlDatePicker;
 import us.isidor.gdl.anaToMia.Widgets.container.GdlUnit;
+import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.isidorus.LoadSchemaCallback;
 import us.isidor.gdl.anaToMia.Widgets.values.CursorValue;
+import us.isidor.gdl.anaToMia.Widgets.views.GdlView;
+
 import com.google.gwt.core.client.EntryPoint;
 import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
@@ -143,7 +151,38 @@
    		
    		
    		
-			GdlDatePicker tmp = new GdlDatePicker(tmpRepresentative);
+			GdlView tmp = new GdlView(tmpRepresentative) {
+				
+				@Override
+				public boolean validate() {
+					// TODO Auto-generated method stub
+					return false;
+				}
+				
+				@Override
+				public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+					// TODO Auto-generated method stub
+					return null;
+				}
+				
+				@Override
+				public ArrayList<String> getStringValue() {
+					// TODO Auto-generated method stub
+					return null;
+				}
+				
+				@Override
+				public void append(GdlVisibleObject ancestor, GdlVisibleObject descendant)throws InvalidGdlSchemaException {
+					// TODO Auto-generated method stub
+					
+				}
+				
+				@Override
+				public TopicMap getContent() {
+					// TODO Auto-generated method stub
+					return null;
+				}
+			};
    		this.mainPanel.add(tmp);
    	}catch(Exception e){
    		e.printStackTrace();
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/complexData/GdlDateTimePicker.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/complexData/GdlDateTimePicker.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/complexData/GdlDateTimePicker.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -2,4 +2,5 @@
public class GdlDateTimePicker extends GdlComplexData {
    // TODO: implement
+
 }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlCreatorAssociationView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlCreatorAssociationView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlCreatorAssociationView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,5 +1,7 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.dom.client.Style.Float;
 import com.google.gwt.dom.client.Style.Overflow;
 import com.google.gwt.event.dom.client.BlurEvent;
@@ -16,12 +18,14 @@
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Construct;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.environment.ActiveStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.FocusStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.HoverStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.values.AbsoluteNumValue;
 import us.isidor.gdl.anaToMia.Widgets.values.AutoNumUnitValue;
 import us.isidor.gdl.anaToMia.Widgets.values.BorderStyleValue;
@@ -420,4 +424,16 @@
    	
    }
+	@Override
+	public ArrayList<String> getStringValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlDefaultCreatorTopicView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlDefaultCreatorTopicView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlDefaultCreatorTopicView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,5 +1,7 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.event.dom.client.BlurEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.event.dom.client.DomEvent;
@@ -11,12 +13,14 @@
 import com.google.gwt.user.client.ui.Widget;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.environment.ActiveStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.FocusStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.HoverStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.values.AbsoluteNumValue;
 import us.isidor.gdl.anaToMia.Widgets.values.AutoNumUnitValue;
 import us.isidor.gdl.anaToMia.Widgets.values.BorderStyleValue;
@@ -461,4 +465,18 @@
    	// TODO Auto-generated method stub
    	
    }
+
+
+	@Override
+	public ArrayList<String> getStringValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+
+	@Override
+	public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
 }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlEditorAssociationView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlEditorAssociationView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlEditorAssociationView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,5 +1,7 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.dom.client.Style.Float;
 import com.google.gwt.dom.client.Style.Overflow;
 import com.google.gwt.event.dom.client.BlurEvent;
@@ -16,12 +18,14 @@
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Construct;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.environment.ActiveStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.FocusStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.HoverStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.values.AbsoluteNumValue;
 import us.isidor.gdl.anaToMia.Widgets.values.AutoNumUnitValue;
 import us.isidor.gdl.anaToMia.Widgets.values.BorderStyleValue;
@@ -463,6 +467,20 @@
    	// TODO Auto-generated method stub
    	
    }
+
+
+	@Override
+	public ArrayList<String> getStringValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+
+	@Override
+	public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialCreatorTopicView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialCreatorTopicView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialCreatorTopicView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,5 +1,7 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.dom.client.Style.Float;
 import com.google.gwt.dom.client.Style.Overflow;
 import com.google.gwt.event.dom.client.BlurEvent;
@@ -15,12 +17,14 @@
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Construct;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.environment.ActiveStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.FocusStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.HoverStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.values.AbsoluteNumValue;
 import us.isidor.gdl.anaToMia.Widgets.values.AutoNumUnitValue;
 import us.isidor.gdl.anaToMia.Widgets.values.BorderStyleValue;
@@ -464,5 +468,19 @@
    	// TODO Auto-generated method stub
    	
    }
+
+
+	@Override
+	public ArrayList<String> getStringValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+
+	@Override
+	public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
    
 }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialEditorTopicView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialEditorTopicView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlSpecialEditorTopicView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,5 +1,7 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.dom.client.Style.Float;
 import com.google.gwt.dom.client.Style.Overflow;
 import com.google.gwt.event.dom.client.BlurEvent;
@@ -15,12 +17,14 @@
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Construct;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMapsTypes;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.environment.ActiveStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.FocusStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.HoverStyleHandler;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
+import us.isidor.gdl.anaToMia.Widgets.environment.Pair;
 import us.isidor.gdl.anaToMia.Widgets.values.AbsoluteNumValue;
 import us.isidor.gdl.anaToMia.Widgets.values.AutoNumUnitValue;
 import us.isidor.gdl.anaToMia.Widgets.values.BorderStyleValue;
@@ -466,5 +470,19 @@
    	// TODO Auto-generated method stub
    	
    }
+
+
+	@Override
+	public ArrayList<String> getStringValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+
+	@Override
+	public ArrayList<Pair<TopicMapsTypes, Object>> getTmValue() {
+		// TODO Auto-generated method stub
+		return null;
+	}
    
 }
Modified: branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlView.java
==============================================================================
--- branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlView.java	Mon Jul 11 06:50:59 2011	(r597)
+++ branches/gdl-frontend/src/anaToMia/GDL_Widgets/src/us/isidor/gdl/anaToMia/Widgets/views/GdlView.java	Mon Jul 11 08:07:34 2011	(r598)
@@ -1,101 +1,82 @@
 package us.isidor.gdl.anaToMia.Widgets.views;
+import java.util.ArrayList;
+
 import com.google.gwt.core.client.JsArray;
-import com.google.gwt.dom.client.Style.Overflow;
-import com.google.gwt.dom.client.Style.VerticalAlign;
-import com.google.gwt.event.dom.client.BlurHandler;
 import com.google.gwt.event.dom.client.ClickHandler;
-import com.google.gwt.event.dom.client.FocusHandler;
-import com.google.gwt.event.dom.client.MouseDownHandler;
-import com.google.gwt.event.dom.client.MouseOutHandler;
-import com.google.gwt.event.dom.client.MouseOverHandler;
-import com.google.gwt.event.dom.client.MouseUpHandler;
-import com.google.gwt.user.client.ui.Widget;
-import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Construct;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Association;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Name;
+import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Role;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.Topic;
 import us.isidor.gdl.anaToMia.TopicMaps.TopicMapsModel.TopicMap;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlPsis;
 import us.isidor.gdl.anaToMia.Widgets.base.GdlVisibleObject;
 import us.isidor.gdl.anaToMia.Widgets.base.IGdlContainer;
+import us.isidor.gdl.anaToMia.Widgets.base.IGdlHasValue;
 import us.isidor.gdl.anaToMia.Widgets.environment.ExecutionException;
 import us.isidor.gdl.anaToMia.Widgets.environment.InvalidGdlSchemaException;
-import us.isidor.gdl.anaToMia.Widgets.environment.MultipleHandlerRegistration;
-import us.isidor.gdl.anaToMia.Widgets.values.ContentOrientationValue;
-public abstract class GdlView extends GdlVisibleObject implements IGdlContainer {
-	private String viewName = "";
-	private TopicMap tm = null;
-	private Topic representative = null;
-	// TODO: implement
-	
+public abstract class GdlView extends GdlVisibleObject implements IGdlContainer, IGdlHasValue {
+	protected GdlView(){
+		super();
+	}
    
    
    public GdlView(Topic tmRepresentative) throws InvalidGdlSchemaException, ExecutionException{
    	super(tmRepresentative);
-		// TODO: implement
    }
    
    
-	protected void init(TopicMap tm, Topic representative) throws InvalidGdlSchemaException {
-		this.tm = tm;
-		this.representative = representative;
-		JsArray<Name> viewNames = representative.getNames(tm.getTopicBySubjectIdentifier(tm.createLocator(GdlPsis.NameType.gdlViewName)));
+	public String getViewName()throws InvalidGdlSchemaException {
+		JsArray<Name> viewNames = super.tmRepresentative.getNames(tm.getTopicBySubjectIdentifier(tm.createLocator(GdlPsis.NameType.gdlViewName)));
    	if(viewNames.length() != 1){
    		throw new InvalidGdlSchemaException("A view must be bound to a " + GdlPsis.NameType.gdlViewName + " instance");
    	}
-		
-		this.viewName = viewNames.get(0).getValue();
+		return viewNames.get(0).getValue();
    }
+		
    
-	
-	public String getViewName(){
-		return this.viewName;
+	public void registerButtonCallback(ClickHandler handler, String id){
+		//TODO: implement
    }
+
    
-	
-	public abstract boolean validate();
-	
-	
-	public abstract TopicMap getContent();
-	
-	
-	public abstract void registerButtonCallback(ClickHandler handler, String id); 
-	
-	
-	public abstract void deregisterButtonCallback(ClickHandler handler, String id);
-	
-	
-	@Override
-	public void setVerticalAlign(Widget widget, VerticalAlign value, String styleClass) throws InvalidGdlSchemaException, ExecutionException {
+	public void deregisterButtonCallback(ClickHandler handler, String id){
    	// TODO: implement
    }
    
    
-	
-	public void setContentOrientation(Widget widget, ContentOrientationValue value){
-		// do nothing - since all content elements are positioned vie the GDL positioning concept
+	// Searches the topic that represents the first item that is playced within this view instance
+	// i.e. such an item must not have an association that is bound to it via a role of the type
+	// gdl:ancestor.
+	protected Topic getStartElement() throws InvalidGdlSchemaException {
+		JsArray<Role> roles = this.tmRepresentative.getRolesPlayed(this.tm.getTopicBySubjectIdentifier(tm.createLocator(GdlPsis.RoleType.gdlContainer)), this.tm.getTopicBySubjectIdentifier(tm.createLocator(GdlPsis.AssociationType.gdlContains)));
+		for(int i = 0; i != roles.length(); ++i){
+			Association assoc = roles.get(i).getParent();
+			JsArray<Role> assocRoles = assoc.getRoles(this.tm.getTopicBySubjectIdentifier(this.tm.createLocator(GdlPsis.RoleType.gdlContainee)));
+			ArrayList<Topic> topsWithoutAncestorPosAssoc = new ArrayList<Topic>();
+			for(int j = 0; j != assocRoles.length(); ++j){
+				Topic player = assocRoles.get(j).getPlayer();
+				if(player.getRolesPlayed(this.tm.getTopicBySubjectIdentifier(this.tm.createLocator(GdlPsis.RoleType.gdlAncestor)), this.tm.getTopicBySubjectIdentifier(this.tm.createLocator(GdlPsis.AssociationType.gdlPosition))).length() == 0){
+					topsWithoutAncestorPosAssoc.add(player);
+				}
+			}
+			if(topsWithoutAncestorPosAssoc.size() > 1){
+				String foundTops = "";
+				for (Topic topic : topsWithoutAncestorPosAssoc) {
+					foundTops += GdlPsis.getAnyIdOfTopic(topic) + ", ";
+				}
+				if(foundTops.length() >= 2)foundTops = foundTops.substring(0, foundTops.length() - 2);
+				throw new InvalidGdlSchemaException("A " + GdlPsis.TopicType.gdlView + " must have maximal one item that is desiganted to tbe the first item in this view, i.e. there must be zero or one items without being bound to a " + GdlPsis.RoleType.gdlAncestor + " but found: " + foundTops);
+			} else if(topsWithoutAncestorPosAssoc.size() == 1){
+				return topsWithoutAncestorPosAssoc.get(0);
+			}
+		}
+		return null;
    }
    
-	
-	
-	
-	
-	// TODO: implement addXYZhandler(handler, id);
-	
-	
-	
-	// hierarchy
-	//
-	//                                       => Default-Topic-View => Default-Creator-Topic-View
-	//                                                             => Default-Editor-Topic-View
-	//                        => Topic-View
-	//                                       => Special-Topic-view => Special-Creator-Topic-view
-	//                                                             => Special-Editor-Topic-View
-	// Visible-Object => View
-	//
-	//                        => Association-view => Creator-Association-view
-	//                                            => Editor-Association-View
-}
+
+	public abstract TopicMap getContent();
+}
\ No newline at end of file

    